Folding overhead door



Oct. 25, 1966 I w. A. DAVIS 3,

FOLDING OVERHEAD DOOR Filed Dec. 23, 1963 4 Sheets-Sheet l Fig.

I 0 Wilbur A. Davis INVENTOR.

# WWW Oct. 25, 1966 w. A. DAVIS 3,280,888

FOLDING OVERHEAD DOOR Filed D60. 23, 1965 4 Sheets-Sheet 5 /4 0 Fly. 7 /6 /00 &' /00 /00 Wilbur A. Davis INVENTOR.

Oct. 25, 1966 w. A. DAVIS FOLDING OVERHEAD DOOR 4 Sheets-Sheet 4 Filed Dec. 23, 1963 T l? //90 I l JnL n In Fig. /2

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ZNVENTOR.

United States Patent 3,280,888 FOLDING OVERHEAD DOOR Wilbur A. Davis, RR 1, Mahomet, Ill. Filed Dec. 23, 1963, Ser. No. 332,552 6 Claims. (Cl. 160-35) This invention relates to a novel and useful folding overhead door and more specifically to an overhead door assembly including opposite side upstanding support and guide means and a door component including a plurality of horizontally elongated vertically stacked door sections pivotally secured together along adjacent upper and lower horizontal edge portions about vertically spaced axes generally paralleling the adjacent edge portions of the door sections. The support and guide means and the door sections include coacting means for supporting and guiding the door sections between a lowered position closing the opening defined between the upstanding support and guide means with the door sections substantially coplanar and raised positions with the door sections disposed in upstanding generally horizontally aligned side-by-side relation and extending across the top of the opening defined between the upstanding support and guide means.

The main object of this invention is to provide a novel and useful folding overhead door assembly constructed in a manner whereby the door assembly may be readily shifted from a lowered position closing a given opening to a raised position with the horizontally elongated door sections disposed in side-byside relation immediately above the door opening and to one side of the medial plane of the door opening. In this manner, the door sections may be readily stored in the inoperative positions without occupying otherwise readily usable space.

Another object of this invention is to provide a folding overhead door assembly in accordance with the preceding objects including means defining a pair of opposite side coplanar abutment fianges projecting toward each other and adapted to have the outer surfaces of the opposite ends of the door sections abutted thereagainst when the door component is in the closed position.

Another object of this invention is to provide a folding overhead door assembly in accordance with the preceding objects including means which -will automatically cam the door sections toward engagement with the abutment flanges upon final movement of the door component to the closed position.

A still further object of this invention is to provide means for yieldingly urging the door component of the instant invention toward an open position and which will be adjustable whereby the yielding means may be adjusted to operate as desired by the owner of the over head door assembly and to compensate for different weights of materials utilized in the construction of the door sections.

A final object of this invention to be specifically enumenat-ed herein is to provide a folding overhead door assembly in accordance with the preceding objects which will conform to conventional forms of manufacture, be of simple construction and easy to use so as to provide a device that will be economically feasible, long-lasting and relatively troublefree in operation.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

FIGURE 1 is a plan elevational view of the door assembly of the instant invention as seen from the inside of the door assembly;

3,280,888 Patented Oct. 25, 1966 FIGURE 2 is a side elevational view of the door assembly illustrated in FIGURE 1 and as seen from the right side of FIGURE 1;

FIGURES 3-8 are transverse vertical sectional views on somewhat of an enlarged scale and taken substantially upon a plane passing through one vertical edge portion of the door assembly and showing the door component in a closed position in FIGURE 3 of the drawings, a fully open position in FIGURE 8 of the drawings, and in various sequential partial open positions in FIGURES 4 through 7 of the drawings;

FIGURE 9 is a fragmentary enlarged horizontal sectional view taken substantially upon a plane indicated by the section line 9-9 of FIGURE 3;

FIGURE 10 is a fragmentary enlarged horizontal sectional view taken substantially upon a plane indicated by the section line 1010 of FIGURE 8;

FIGURE 11 is a somewhat enlarged fragmentary perspective "view of one of the door sections of the door component and showing the manner in which it is guided toward the open position;

FIGURE 12 is an elevational view of a modified form of door assembly which is manually actuated as opposed to the electrically powered form of the invention illustrated in FIGURES l-ll and FIGURE 13 is a somewhat enlarged perspective view of an anchor plate which may be utilized to adjust the means by which the door sections of the door assembly illustrated in FIGURES l-ll are normally yieldingly urged toward the raised open positions.

Referring now more specifically to the drawings the numeral 10 generally designates the folding overhead door assembly of the instant invention which includes a pair of opposite side upstanding support and guide means generally referred to by the reference numerals 12 and 14 and interconnected at their upper ends by means of a horizontally elongated header assembly generally referred to by the reference numeral 16.

The upstanding support and guide means 12 and 14 are formed in substantially the same manner with the exception that they are mirror images of each other and may each include slight modifications as desired. 'However, their operation will be substantially the same in each instance and therefore only the lefthand upstanding and support guide means 12, as viewed from the inside of the door assembly, will be described in full detail together with some of the modifications of the righthand support and guide means 14.

The door component includes a plurality of horizontally elongated and vertically stacked door sections 18, 20, 22, 24 and 26. While more than five door sections may be used, in accordance with the novel manner in which the door sections are mounted, as will be hereinafter more fully set forth, the door sections preferably equal an odd number of three or more. Adjacent upper and lower marginal edge portions of the sections are pivotally secured together by means of binge assemblies 28, 30, 32 and 34. As can perhaps best be seen from FIGURE 6 of the drawings the hinge assembly 28 pivotally secures the door section 20 to the door section 18 for swinging movement of the lower end of the door section 20 inwardly and upwardly to a position in side-by-side relation with the door section 18. The hinge assembly 30 pivotally secures the door section 22 to the door section 20 for sequential inward, upward, and outward swinging movement of the upper edge portion thereof relative to the adjacent edge of the door section 20 while the lower edge of the door section 22 remains disposed in the plane of the unfolded lower portion of the door component. The hinge assemblies 32 and 34 pivotally mount the door sections 24 and 26 to the door sections 22 and 24, re-

spectively, for movement of the door sections 24 and 26 relative to the door section 22 in the same manner in which the hinge assemblies 28 and 30 pivotally support the door sections 20 and 22 for movement relative to the door section 18.

Each of the opposite 'side upstanding support guide means 12 and 14 comprises a plate-like member and it may be seen that each member defines a first upper guide track or guide 36, a second guide or track and a third guide or track 40. The door section '18 has two pairs of rollers or followers 42 and 44 on its upper and lower marginal edge portions, respectively, on opposite ends thereof and the rollers or followers at 42 and 44 are slidingly received in the corresponding tracks or guides 36 defined by the upstanding support guide means 12 and 14. In addition, the door section 20 has a roller or follower 46 on each end thereof adjacent its lower marginal edge portion which is adapted for engagement with a first camming member 47 defined by the corresponding upstanding support and guide means. Still further, the door section 24 has a roller or follower 48 on each end thereof adjacent its upper marginal edge portion which is slidably engaged with the second guide or track 38. Still further, the bottom door section 26 includes a pair of rollers or followers 50 at opposite ends of its upper marginal edge portion which is slidably engage the guide or track 40 and a pair of rollers or followers 52 at opposite ends of its lower marginal edge portion which are also slidably engaged with the-second guide or track3'8.

From FIGURES 31-8 of the drawings it may further be seen that the third guide or track -'40 includes an inwardly curved and open upper end portion 40' while the second guide or track 38 includes an outwardly and upwardly inclined upper end portion 38'.

In addition, the door section '24 includes a pair of opposite end rollers or followers 54 which are adapted to rollingly engage the arcuate surface 56 defined by a pair of guide plates 58 supported from the support guide means 12 and 14. V

As can best be seen from FIGURE of the drawings the tracks 36, 38 and 38' are defined by inwardly opening grooves with channels formed in the corresponding support and guide means'12 and 14 and which are partially closed by means of roller retaining strips 58,, 60 and 62, respectively secured 'to the inner surfaces of the support and guide means 12 and 14 in any convenient manner. It may also be seen from FIGURE 9 of the drawings that the roller or follower 48 is journaled on a shaft 64 projecting outwardly from the edge of the door section 24. Additionally, it may be seen that the roller 50 .is supported from the door section'2'6 and that the door section 26 also supports an outwardly projecting arm 66.

From FIGURE 1 of the drawings it may .be seen that the door section 26 includes a pair of the arms 66 and that these arms project outwardly from the opposite ends of the door section 26 adjacent its lower marginal edge portion. I

Further, from FIGURE 1 of the drawings it may also be seen that a pivoted handle 68 may be provided connected to an actuating disk 70 by means of abutting connecting straps 72-and 72", which-disk 70has a pair of locking rods 73 and 74 ,pivotally secured thereto .at one pair -of corresponding ends,the free ends of the locking rods 73 and 74 being removably received in socketdefining members 78 and '80 supported from the support and guide means 12 and 14, respectively. An expansion spring 82 is connected between the door section "26 and the lockingrod 73 and normally yield-ingly urges the looking rods 73 and 74 toward their extended and locked positions.

In addition to the guides or tracks 36, 38., 40 and 38' a type of guide 84 is provided and comprises a cam plate mounted on each of the support and guide means 12 and 14 and including a cam surface 86 for camming the rollers 46 forwardly of the opening 88 defined between the support and guide means 12 and 14. The support and guide means 12 and 14 may be said to be formed partially by the wall sections 90, FIGURE 9, to which they are secured and it will be noted that the wall sections 90 on opposite sides of the opening 88 define coplanar flange portions 98 against which the outer faces of the opposite end portions of the door sections 18, 20, 22, 24 and 26 abut when the door component formed by the door sections is in the closed position. In addition, each track or guide 40 includes an outwardly angulated lower end portion 100 which is engaged by the corresponding roller 50 upon final movement of the door component toward the closed position in order to cam the door section 26 into tight frictional engagement with the flanges 98. Further, it may be seen from FIGURES 38 of the drawings that the guide or track 36 includes a lower end cam surface 102 for camming the roller 44 forwardly upon final movement of the door component toward the closed position thereby camming the door section 18 into tight seating engagement with theflanges 98.

With attention now directed more specifically to FIG- URES 1 and 38 of the drawings, it may be seen that a mounting or anchor plate 104, see also FIGURE 13, is secured to the end surface of the header panel 106 extending between the support and guide means 12 and 14. Any suitable means may be utilized to secure the anchor plate 104 to the header plate 106 and the opposite ends of a pair of expansion springs 108 and 110 are secured in a selected one of a plurality of apertures 111 formed in the plate 104. The free ends of the expansion springs 108 and 110 are connected to corresponding ends of a pair of elongated flexible tension members 112 and 114 which are entrained over pulleys 116 and 118 at-opposite ends of the header plate 106 and then passed downwardly alongside the support and guide means 12 and 14, respectively, for securement at their free ends by any convenient means as at 120 and 122 to the opposite ends of the uppermost door section 18 adjacent the lower marginal edge portion thereof.

The expansion springs 108 and 110 serve to raise the door section 18 to its uppermost position illustrated in FIGURES 5-8 of the drawings whereupon the other door sections 20, 22, 24 and '26 may continue to be raised in a manner which is to be hereinafter more fully set forth without the uppermost door section sliding downwardly in the groove or track 36.

With attention now invited to FIGURE 11 'as well as FIGURES 3-8, it may be seen that a pivoting bar 124 is secured to each .end of the door section 24 and that each pivoting bar 124 includes a rounded end portion 126 which is engageable with a roller 128 journaled from the corresponding support and guide means. As can best be seen from FIGURE 7 of the drawings wherein two different positions of the door section 24 are illustrated in phantom lines, as the door section 24 has its lower end pivoted inwardly and upwardly with the roller 54 engaged with the arcuate surface 56, the upper horizontal edge portion .of the door section 24 has a tendency to swing downwardly which would in-turn-have a tendency to unfold the foldeddoor sections 18, 20 and 22. However, the rounded ends of the pivoting bars 124 engage the rollers 128 and enable the upper marginal edge .portion of the door section 24 to pivot about the rollers 128 thereby. insuring that the door sections 18, 20 and 22 will remain in the raised stored positions illustrated in FIGURES 7 and 8 of the drawings.

With attention now directed more specifically to FIG- URES 1-3 of the drawings it may be seen that an electric motorof any suitable type referred to by the reference numeral 134 is supported from the support and guide means 12, the motor 134 having a transmission 136 operatively driven thereby. The transmission 136 includes an output shaft 140 which is journaled between the support and guide means 12 and 14 and has a sprocket wheel 142 mounted thereon. Each of the support and guide means 12 and 14 has a second pair of sprocket wheels 144 and 146 journaled therefrom and each support and guide means 12 and 14 further includes a chain tightening abutment 148. An endless chain 150 is entrained over each set of sprocket wheels 142, 146 and 148 and each chain 150 has a special side link 152 therein including a laterally directed flange portion 154 which is secured to the free end of the corresponding arm 66 in any convenient manner such as by a fastener 156. It is to be understood that the electric motor 134 is of the reversible type and that suitable controls therefor including limit switches for automatically reversing the motor 134 may be provided in order that the latter may be utilized to oscillate the chains 150 about their predetermined paths of movement to thereby raise and lower the door component by means of the connection defined by the fasteners 156 between the flange portions 154 and the arms 66. While the locking mechanism defined by the handle 68 and its associated parts is not essential to the form of the invention illustrated in FIGURES l-ll and FIGURE 13 inasmuch as the transmission 136 will prevent the door component from being raised or lowered unless the motor 134 is actuated, the transmission providing for a substantial speed reduction of the shaft 140 relative to the speed of the output shaft (not shown) of the motor 134, this mechanism is considered to be essential to the manual form of the invention illustrated in FIGURE 12 as will be hereinafter more fully set forth.

With attention now invited to FIGURES 3-8 of the drawings, it may be seen that in FIGURE 3 of the drawings the door component is in the fully closed position with the door sections 18, 20, 22, 24 and 26 cammed into tight frictional engagement with the coplanar flanges 98 defined by the wall sections 90 in the manner hereinbefore set forth. Upon initial actuation of the electric motor 134 to raise the door component, the entire component is raised in the position illustrated in FIGURE 4 of the drawings, in which position the cam members 47 have cammed the rollers 46 slightly outwardly to buckle the door component between the sections 20 and 22 thereof. Then, as the lower end of the door component continues to be raised, the lower edge of the door section 20 swings inwardly and upwardly as the upper door section 18 moves to its uppermost position. Then, as the door component reaches the position illustrated in FIGURE 6 of the drawings, the rollers 50 are cammed outwardly by the outwardly directed upper end portion 40' of the track 40. It is at this point that the rounded ends 126 of the bars 124 engage the rollers 128 to prevent the door sections 18, 20 and 22 from swinging toward the closed position. Then, upon final movement of the lowermost door section 126 to its raised position from the position illustrated in FIGURE 7 of the drawings, the rollers 132 are received in the tracks 38' and the rollers 52 reach their uppermost position at the intersection of the tracks 38 and 38 as illustrated in FIGURE 8 of the drawings. When the door component is in the fully raised position it may be seen that it is raised completely above the door opening normally closed by the door component and whose upper limit is defined by the header member 160.

With attention now directed more specifically to FIG- URE 12 of the drawings, there may be seen a modified form of door assembly generally referred to by the reference numeral 162 which is substantially identical to the door assembly but which is manually actuated and which includes a pair of full width expansion springs 164 and 166 which are anchored at opposite ends by anchors 168 and 170 in any convenient manner to selected portions of the wall sections (not shown) between which the opening to be closed by the door assembly 166 is formed. The other ends of the expansion springs 164 and 166 are connected to corresponding ends of a pair of elongated pull members 172 and 174, which pull members are entrained about corresponding pairs of pulleys 176 and 178 and 180 and 182 respectively. The ends of the pull members 172 and 174 remote from the springs 164 and 166 are secured to the lowermost section 184 with the door component of the door assembly 162 by means of laterally outwardly projecting arms 186 and 188, respectively corresponding to the arms 66. Inasmuch as the expansion springs 164 and 166 extend the full width of the door assembly they are capable of being elongated and contracted between fully contracted and elongated positions, respectively, a suflicient distance to lower and raise the door component of the door assembly 162. Otherwise, the operation of the door assembly 162 is substantially identical to the operation of the door assembly 10 and it is to be understood that the expansion springs 164 and 166 substantially fully counterbalance the weight of the door component of the door assembly 162 in its various positions of movement.

Further, as previously set forth, the door assembly 162 is provided with a locking mechanism generally referred to by the reference numeral 190 substantially identical to the optional locking mechanism provided on the door assembly 10.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A folding overhead door assembly comprising op-,

posite side upstanding support and guide means defining a door opening therebetween, an upstanding door component comprising a plurality of upstanding horizontally elongated and vertically stacked door sections, means pivotally securing adjacent door sections together along adjacent upper and lower horizontal edge portions thereof for relative swinging movement about axes generally paralleling said adjacent edge portions and for movement between lowered substantially coplanar positions substantially closing said door opening and raised alternately oppositely folded generally horizontally aligned and sideby-side upstanding positions extending between the upper end portions of said support and guide means, said support and guide means each including first guide means for the uppermost door section, second guide means, third guide means, and fourth guide means, the uppermost door section including first follower means engageable with said first guide means and operative to guide said uppermost section upwardly to an upper limit position while maintaining said uppermost door section in an upstanding position and during initial raising of the door component from the lower end thereof, said component including second follower means adjacent the lower and upper marginal edge portions of the second and third from the top sections of the component engageable with said second guide means and operable, during said initial raising of said door component, to swing said second follower means laterally toward one side of the medium plane of said opening during further upward movement of the lower portion of said component, said component including third follower means adjacent the adjacent lower and upper marginal edge portions of the third and fourth from the top sections of said component engageable with said third guide means and operative to guide said third follower means in a generally upward direction during said initial and further upward movement of the lower portion of said component as well as during still further upward movement of the lower portion of said component, said component including fourth follower means adjacent the lower and upper marginal edge portions of the fourth and fifth from the top sections of said component engageable with said fourth guide means operative to guide said fourth follower means in a generally upward direction during said initial, further, and still further upward movement of the lower portion of said component and to then cam said fourth follower means laterally to said one side of said plane, said support and guide means also including fifth guide means and the lower marginal portion of the fifth from the top section of said component including fifth follower means engageable with said fifth guide means, said fifth guide means being operative to guide said fifth follower means in a generally upward direction during substantially all of the upward movement of said fifth from the top section.

2. The combination of claim 1 including counterbalance means operatively connected between said support and guide means and said door component yieldingly urging said door component toward the raised position,

3. The combination of claim 1 wherein said support and guide means include means defining a pair of opposite side coplanar abutment flanges projecting toward each other and adapted to have the outer surfaces of the pposite ends of said door sections abut thereagainst, said second, third and fourth follower means and said support and guide means also including means operative to cam said door sections toward engagement with said abutment flanges upon final movement of said door component to the closed position with said door sections substantially coplanar.

4. The combination of claim 1 including counterbalance means operatively connected between said support and guide means and said door component yieldingly urging said door component toward the raised position,

said counterbalance means including means for adjusting the effective force applied thereby on said door component.

5. The combination of claim 1 wherein said door assembly includes an elongated horizontally disposed header section interconnecting the upper ends of said opposite side support and guide means behind which said sections are disposed when in the raised positions.

6. The combination of claim 1 wherein said door component and said support and guide means include means for releasably retaining said door component in the lowered closed position.

References Cited by the Examiner UNITED STATES PATENTS 7 437,597 9/1890 Hicks 160193 X 1,709,872 4/1929 Peelle 160-207 X 1,801,220 4/1931 Brown 160-190 1,962,913 6/1934 Rutledge l190 2,020,544 11/1935 Gille et al. 207 2,423,987 7/1947 Levikow 160207 X 3,092,173 6/1963 Hostetler 160--191 X 3,177,530 4/1965 Depew 160-209 X FOREIGN PATENTS 75,929 11/ 1949 Norway. 176,557 9/ 1935 Switzerland.

HARRISON R. MOSELEY, Primary Examiner.

D. L. TAYLOR, Assistant Examiner. 

1. A FOLDING OVERHEAD DOOR ASSEMBLY COMPRISING OPPOSITE SIDE UPSTANDING SUPPORT AND GUIDE MEANS DEFINING A DOOR OPENING THEREBETWEEN, AN UPSTANDING DOOR CONPONENT COMPRISING A PLURALITY OF UPSTANDING HORIZONTALLY ELONGATED AND VERTICALLY STACKED DOOR SECTIONS, MEANS PIVOTALLY SECURING ADJACENT DOOR SECTIONS TOGETHER ALONG ADJACENT UPPER AND LOWER HORIZONTAL EDGE PORTIONS THEREOF FOR RELATIVE SWINGING MOVEMENT ABOUT AXES GENERALLY PARALLELING SAID ADJACENT EDGE PORTIONS AND FOR MOVEMENT BETWEEN LOWERED SUBSTANTIALLY COPLANAR POSITIONS SUBSTANTIALLY CLOSING SAID DOOR OPENING AND RAISED ALTERNATELY OPPOSITELY FOLDED GENERALLY HORIZONTALLY ALIGNED AND SIDEBY-SIDE UPSTANDING POSITIONS EXTENDING BETWEEN THE UPPER END PORTIONS OF SAID SUPPORT AND GUIDE MEANS, SAID SUPPORT AND GUIDE MEANS EACH INCLUDING FIRST GUIDE MEANS, THIRD THE UPPERMOST DOOR SECTION, SECOND GUIDE MEANS, THIRD GUIDE MEANS, AND FOURTH GUIDE MEANS, THE UPPERMOST DOOR SECTION INCLUDING FIRST FOLLOWER MEANS ENGAGEABLE WITH SAID FIRST GUIDE MEANS AND OPERATIVE TO GUIDE SAID UPPERMOST SECTION UPWARDLY TO AN UPPER LIMIT POSITION WHILE MAINTAINING SAID UPPERMOST DOOR SECTION IN AN UPSTANDING POSITION AND DURING INITIAL RAISING OF THE DOOR COMPONENT FROM THE LOWER END THEREOF, SAID COMPONENT INCLUDING SECOND FOLLOWER MEANS ADJACENT THE LOWER AND UPPER MARGINAL EDGE PORTIONS OF THE SECOND AND THIRD FROM THE TOP SECTIONS OF THE COMPONENT ENGAGEABLE WITH SAID SECOND GUIDE MEANS AND OPERABLE, DURING SAID INITIAL RAISING OF SAID DOOR COMPONENT, TO SWING SAID SECOND FOLLOWER MEANS LATERALLY TOWARD ONE SIDE OF THE MEDIUM PLANE OF SAID OPENING DURING FURTHER UPWARD MOVEMENT OF THE LOWER PORTION OF SAID COMPONENT, SAID COMPONENT INCLUDING THIRD FOLLOWER MEANS ADJACENT THE ADJACENT LOWER AND UPPER MARGINAL EDGE PORTIONS OF THE THIRD AND FOURTH FROM THE TOP SECTIONS OF SAID COMPONENT ENGAGEABLE WITH SAID THIRD GUIDE MEANS AND OPERATIVE TO GUIDE SAID THIRD FOLLOWER MEANS IN A GENERALLY UPWARD DIRECTION DURING SAID INITIAL AND FURTHER UPWARD MOVEMENT OF THE LOWER PORTION OF SAID COMPONENT AS WELL AS DURING STILL FURTHER UPWARD MOVEMENT OF THE LOWER PORTION OF SAID COMPONENT, SAID COMPONENT INCLUDING FOURTH FOLLOWER MEANS ADJACENT THE LOWER AND UPPER MARGINAL EDGE PORTIONS OF THE FOURTH AND FIFTH FROM THE TOP SECTIONS OF SAID COMPONENT ENGAGEABLE WITH SAID FOURTH GUIDE MEANS OPERATIVE TO GUIDE SAID FOURTH FOLLOWER MEANS IN A GENERALLY UPWARD DIRECTION DURING SAID INITIAL, FURTHER, AND STILL FURTHER UPWARD MOVEMENT OF THE LOWER PORTION OF SAID COMPONENT AND TO THEM CAM SAID FOURTH FOLLOWER MEANS LATERALLY TO SAID ONE SIDE OF SAID PLANE, SAID SUPPORT AND GUIDE MEANS ALSO INCLUDING FIFTH FROM GUIDE MEANS AND THE LOWER MARGINAL PORTION OF THE FIFTH FROM THE TOP SECTION OF SAID COMPONENT INCLUDING FIFTH FOLLOWER MEANS ENGAGEABLE WITH SAID FIFTH GUIDE MEANS, SAID FIFTH GUIDE MEANS BEING OPERATIVE TO GUIDE MEANS, SAID FOLLOWER MEAN IN A GENERALLY UPWARD DIRECTION DURING SUBSTANTIALLY ALL OF THE UPWARD MOVEMENT OF SAID FIFTH FROM THE TOP SECTION. 